Possible Clues:

• Cows, etc
• Heard of them, by the sound of it (6)
• Stock farm
• Not making Yeats' ''low sounds by the shore''
• The stock market is the place to buy them
• Cows, steers
• Heard, by the sound of it, of such as the start of 4 down
• Ruminant animals with horns and cloven feet
• Heard the sound of them?
• Heard the sound of them